期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 434, 期 -, 页码 28-33出版社
ELSEVIER
DOI: 10.1016/j.palaeo.2015.02.006
关键词
Ediacara biota; Ediacaran period; Dickinsonia; South Australia; Taphonomy
资金
- U.S. National Science Foundation [EAR-0074021]
- NASA [NNG04GJ42G]
- Australian Council Discovery Grant [DP0453393]
- GSA
- SEPM
- Paleontological Society
- Lewis and Clark fund for Exploration and Field Research in Astrobiology
- NSF EAPSI
- Office Of The Director
- Office Of Internatl Science &Engineering [1414911] Funding Source: National Science Foundation
Dickinsonia, an iconic member of the Ediacara biota, is abundant in the Ediacaran deposits found at the Nilpena field site, South Australia. Despite exquisite fossil preservation at this site, many specimens of Dickinsonia appear to be incomplete, with an apparently missing piece on the periphery. Orientation measurements from specimens on three fossil beds suggest that these so-called missing pieces are aligned irrespective of the axial orientation of Dickinsonia. The nonrandom orientation of incomplete specimens matches that of other aligned structures found on two of these beds. The preferred directionality of this feature suggests the molding of incomplete specimens under the influence of current activity prior to or during burial. We propose that this feature originates where part of a Dickinsonia was lifted off of the substrate during a storm event and that sand was deposited beneath this lifted portion. This model suggests that Dickinsonia was easily separated from the sea floor and was not attached to the substrate on which it lived. This is consistent with the data from Dickinsonia footprints suggesting that Dickinsonia was mobile. (C) 2015 Elsevier B.V. All rights reserved.
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